This figure is down from 0% in March and economists leading up to today's figures predicted that it may be the case, with low oil prices and ongoing supermarket price wars leading to the deflation.
The ONS said: "The main downward push on inflation came from air and sea fares. Prices for both rose on the month, but by far less than a year ago, with the timing of Easter a likely factor."
It is the first time the rate of inflation has slipped below zero since 1960.
âDeflation has hit the UK, but looks unlikely to stay for long," said Chris Williamson, chief economist at Markit.
"The on-going lack of inflation is a boon for consumers, acting as a welcome surrogate for wage growth which, although showing signs of rising, remains subdued.
"Alongside falling unemployment, low prices, especially for fuel, have boosted consumer spending, which is consequently providing the main thrust to economic growth at the moment."
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